SATHEE: The dand fblock elements

The dand fblock elements - Result Question 23

####23. In which of the following pairs are both the ions coloured in aqueous solutions ?

[2006]

(a) $S c^{3 +}, T i^{3 +}$

(b) $S c^{3 +}, C o^{2 +}$

(d) $N i^{2 +}, T i^{3 +}$

(At. no. : $S c = 21, T i = 22, N i = 28, C u = 29, C o = 27$ )

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Solution:

(d) $S c^{3 +} : 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{0}, 4 s^{0}$ ; no unpaired electron.

$C u^{+} : 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{10}, 4 s^{0}$ ; no unpaired electron.

$N i^{2 +} : 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{8}, 4 s^{0}; 2$ unpaired electron present.

$T i^{3 +} : 1 s^{2}, 2 s^{2} p^{6}, 2 s^{2} p^{6} d^{1}, 4 s^{0}; 1$ unpaired electron present

$C o^{2 +} : 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{7}, 4 s^{0}; 3$ unpaired electron present

So, from the given option, the only correct combination is $N i^{2 +}$ and $T i^{3 +}$

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The dand fblock elements - Result Question 23

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